diff options
| -rw-r--r-- | lib/Target/PowerPC/PPCISelDAGToDAG.cpp | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp index 459ddfaeb8..2941b34266 100644 --- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp +++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp @@ -616,11 +616,21 @@ bool PPCDAGToDAGISel::SelectAddrIdxOnly(SDOperand N, SDOperand &Base, // Check to see if we can easily represent this as an [r+r] address. This // will fail if it thinks that the address is more profitably represented as // reg+imm, e.g. where imm = 0. - if (!SelectAddrIdx(N, Base, Index)) { - // Nope, do it the hard way. - Base = CurDAG->getRegister(PPC::R0, MVT::i32); - Index = N; + if (SelectAddrIdx(N, Base, Index)) + return true; + + // If the operand is an addition, always emit this as [r+r], since this is + // better (for code size, and execution, as the memop does the add for free) + // than emitting an explicit add. + if (N.getOpcode() == ISD::ADD) { + Base = N.getOperand(0); + Index = N.getOperand(1); + return true; } + + // Otherwise, do it the hard way, using R0 as the base register. + Base = CurDAG->getRegister(PPC::R0, MVT::i32); + Index = N; return true; } |